[Linux-ia64] Re: is casting of function descriptor assignments for ia64 ONLY a good idea?

From: <law_at_redhat.com>
Date: 2002-01-04 04:11:20
  > Not just ia64, powerpc 64 as well.  You are assuming that all pointers
  > are the same format when that is not guaranteed by the C standard.  On
  > most architectures they are the same, you can convert a function
  > pointer to a void pointer and back again but it is not defined
  > behaviour.
  > 
  > On IA64 and PPC64 the function pointer does not reference the function
  > itself, instead it points to a function descriptor.  The function
  > descriptor contains a pointer to the function code plus additional data
  > such as a pointer to the global data to be used when the function is
  > called.  This is mandated by the architecture software ABI.
Also true for HPPA targets.
jeff
Received on Thu Jan 03 09:15:10 2002

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